package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        // 3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        // 4.保存验证码到session
//        session.setAttribute("code", code);

        // 4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.info("发送短信验证码成功,验证码:{}", code);
        //返回OK
        return Result.ok();
    }

    public Result login(LoginFormDTO loginForm, HttpSession session){
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }

        //3.从redis获取验证码并校验
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            //不一致，报错
            return Result.fail("验证码错误");
        }
        //3.从Session获取验证码并校验
//        Object cacheCode = session.getAttribute("code");
//        String code = loginForm.getCode();
//        if(cacheCode == null || !cacheCode.toString().equals(code)){
//            //不一致，报错
//            return Result.fail("验证码错误");
//        }


        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user == null){
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }

        //7.保存用户信息到session中
//        session.setAttribute("user", BeanUtil.copyProperties(user, User.class));
        //7.保存用户信息到redis中
        //7.1随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString();
        //7.2将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String,Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //7.3存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll("login:token" + token, userMap);
        //7.4设置token有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);

        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setPassword(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
